DE102007020596A1 - Detector arrangement for non-dispersive infrared gas analyzer, has N-dimensional calibration matrix received signal values of sensors in presence from different well-known transverse gas concentrations - Google Patents
Detector arrangement for non-dispersive infrared gas analyzer, has N-dimensional calibration matrix received signal values of sensors in presence from different well-known transverse gas concentrations Download PDFInfo
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- DE102007020596A1 DE102007020596A1 DE102007020596A DE102007020596A DE102007020596A1 DE 102007020596 A1 DE102007020596 A1 DE 102007020596A1 DE 102007020596 A DE102007020596 A DE 102007020596A DE 102007020596 A DE102007020596 A DE 102007020596A DE 102007020596 A1 DE102007020596 A1 DE 102007020596A1
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- 239000011159 matrix material Substances 0.000 title claims abstract description 19
- 238000011156 evaluation Methods 0.000 claims abstract description 12
- 239000002356 single layer Substances 0.000 claims description 47
- 239000000203 mixture Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 7
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 70
- 230000005855 radiation Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000004868 gas analysis Methods 0.000 description 2
- 238000007620 mathematical function Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/37—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using pneumatic detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
- G01N21/61—Non-dispersive gas analysers
Abstract
Description
Die Erfindung betrifft eine Detektoranordnung für einen nichtdispersiven Infrarot-(NDIR-)Gasanalysator zum Nachweis einer Messgaskomponente in einem Gasgemisch, mit einem ersten Einschichtempfänger und mindestens einem weiteren Einschichtempfänger, die hintereinander im Strahlengang des Gasanalysators liegen, wobei der erste Einschichtempfänger die Messgaskomponente und der mindestens eine weitere Einschichtempfänger ein Quergas oder die Messgaskomponente – auch in einer anderen Konzentration als der erste Einschichtempfänger – enthält, und mit einer Auswerteeinrichtung zur Ermittlung der Konzentration der Messgaskomponente in dem Gasgemisch aus von druck- oder strömungsempfindlichen Sensoren der Einschichtempfänger gelieferten Signalen.The The invention relates to a detector arrangement for a non-dispersive Infrared (NDIR) gas analyzer for detection of a sample gas component in a gas mixture, with a first single-layer receiver and at least one further single-layer receiver, one behind the other lie in the beam path of the gas analyzer, wherein the first single-layer receiver the measurement gas component and the at least one further single-layer receiver a transverse gas or the sample gas component - even in one concentration other than the first single-layer receiver, and with an evaluation device for determining the concentration of Sample gas component in the gas mixture of pressure or flow sensitive Sensors of the single-layer receiver supplied signals.
Eine
derartige, aus der
Bei
der aus der
Der Erfindung liegt die Aufgabe zugrunde, eine Kompensation des Einflusses von Quergasen auf das Messergebnis zu ermöglichen, ohne dass die oben genannte Voraussetzung erfüllt sein muss.Of the Invention is based on the object, a compensation of the influence of cross gases to allow the measurement result without that the above requirement must be fulfilled.
Gemäß der Erfindung wird die Aufgabe dadurch gelöst, dass bei der Detektoranordnung der eingangs angegebenen Art die Auswerteeinrichtung eine entsprechend der Anzahl n der Einschichtempfänger n-dimensionale Kalibrationsmatrix enthält, in der bei unterschiedlichen bekannten Konzentrationen der Messgaskomponente in Anwesenheit von unterschiedlichen bekannten Quergaskonzentrationen erhaltene Signalwerte der Sensoren als n-Tupel abgespeichert sind, und dass die Auswerteeinrichtung dazu ausgebildet ist, beim Messen von unbekannten Konzentrationen der Messgaskomponente in Anwesenheit von unbekannten Quergaskonzentrationen durch Vergleich der dabei erhaltenen n-Tupel von Signalwerten mit den in der Kalibrationsmatrix abgespeicherten n-Tupeln von Signalwerten die Konzentration der Messgaskomponente zu ermitteln.According to the Invention, the object is achieved in that in the Detector assembly of the type specified the evaluation one corresponding to the number n of the single-layer receiver n-dimensional calibration matrix contains in the case of different known concentrations of the sample gas component in the presence of signal values obtained from different known interfering gas concentrations the sensors are stored as n-tuple, and that the evaluation device is designed to measure unknown concentrations the sample gas component in the presence of unknown gas cross-concentrations by comparing the obtained n-tuple of signal values with the n-tuples of signal values stored in the calibration matrix to determine the concentration of the sample gas component.
Vorteilhafte Weiterbildungen der erfindungsgemäßen Detektoranordnung sind in den Unteransprüchen angegeben.advantageous Further developments of the detector arrangement according to the invention are given in the subclaims.
Das Sensorsignal eines jeden Einschichtempfängers enthält neben dem durch die Strahlungsabsorption in dem eigenen Einschichtempfänger erzeugten hauptsächlichen Signalanteil auch geringere Signalanteile aus den jeweils anderen Einschichtempfängern. Die Sensorsignale von n Einschichtempfängern bilden daher eine n-dimensionale Ergebnismatrix. Enthält der erste Einschichtempfänger die Messgaskomponente und sind die nachgeordneten n – 1 Einschichtempfänger mit unterschiedlichen Quergasen gefüllt, so lässt sich die Konzentration einer Messgaskomponente auch in Anwesenheit der Quergase in unterschiedlichen Konzentrationen ermitteln. Dazu werden entsprechend der Erfindung zunächst die bei verschiedenen bekannten Konzentrationen der Messgaskomponente in Anwesenheit von verschiedenen bekannten Konzentrationen der n – 1 unterschiedlichen Quergase erhaltenen Signalwerte als n-Tupel zusammen mit dem jeweiligen bekannten Konzentrationswert der Messgaskomponente in einer Kalibrationsmatrix abgespeichert. Soll dann später eine unbekannte Konzentration der Messgaskomponente in Anwesenheit der Quergase, deren Konzentrationen ebenfalls unbekannt sind, ermittelt werden, so werden die dabei erhaltenen n-Tupel von Signalwerten mit den in der Kalibrationsmatrix abgespeicherten n-Tupeln von Signalwerten verglichen und der entsprechende Konzentrationswert der Messgaskomponente aus der Kalibrationsmatrix ermittelt.The sensor signal of each single-layer receiver contains, in addition to the main signal component generated by the radiation absorption in the own single-layer receiver, also lower signal components from the respective other single-layer receivers. The sensor signals of n single-layer receivers therefore form an n-dimensional result matrix. If the first single-layer receiver contains the sample gas component and the downstream n-1 single-layer receivers are filled with different transverse gases, the concentration of a sample gas component can also be determined in different concentrations in the presence of the transverse gases. For this purpose, according to the invention, first the signal values obtained at different known concentrations of the sample gas component in the presence of different known concentrations of the n-1 different transverse gases are stored as n-tuples together with the respective known concentration value of the sample gas component in a calibration matrix. Should then later an unknown concentration of the sample gas component in the presence of the transverse gases, their concentrations are also unknown, the n-tuples thus obtained are compared by signal values with the n-tuples of signal values stored in the calibration matrix, and the corresponding concentration value of the sample gas component is determined from the calibration matrix.
Für die Erstellung der Kalibrationsmatrix reicht eine begrenzte Anzahl von Messungen mit bekannten Konzentrationen der Messgaskomponente in Anwesenheit von bekannten Konzentrationen der Quergase aus, um eine Reihe von Stützwerten zu erhalten, von denen ausgehend die Kalibrationsmatrix mittels eines Simulationsprogramms beispielsweise durch Interpolation der Stützwerte bzw. Extrapolation komplettiert wird. Der Begriff Kalibrationsmatrix umfasst hier auch die sie beschreibende mathematische Funktionen und ihre Parameter.For the creation of the calibration matrix is limited measurements with known concentrations of the sample gas component in the presence of known concentrations of the transverse gases to obtain a set of supporting values from which to base the calibration matrix by means of a simulation program, for example completed by interpolation of the supporting values or extrapolation becomes. The term calibration matrix also includes here the descriptive mathematical functions and their parameters.
Die allgemeine Anwendbarkeit der Erfindung wird nur durch die Dynamikbereiche der jeweiligen Gase eingeschränkt. In der Praxis müssen daher sowohl der Dynamikbereich der Messgaskomponente als auch die Dynamikbereiche der Quergase durch die entsprechende Auslegung des Gasanalysators (Strahler, Länge der verwendeten Küvetten und Detektorkammern) an die Anforderungen angepasst werden.The general applicability of the invention is only by the dynamic ranges restricted to the respective gases. In practice, need hence both the dynamic range of the sample gas component and the dynamic ranges the transverse gases by the appropriate design of the gas analyzer (Emitter, length of the used cuvettes and Detector chambers) can be adapted to the requirements.
Alternativ zur Füllung der weiteren Einschichtempfänger mit Quergasen können diese auch mit der Messgaskomponente gefüllt werden. Dies kann mit unterschiedlichen Konzentrationen geschehen, wobei die Konzentration in dem ersten Einschichtempfänger vorzugsweise am geringsten ist. Dabei werden, nicht wie oben, die Quergase direkt, sondern lediglich ihr Einfluss auf die Messung der Konzentration der Messgaskomponente bestimmt. Dadurch sind Quergaseinflüsse direkt mit der notwendigen Genauigkeit der Messgaskomponente kompensierbar, ohne dass die Dynamikbereiche der Quergase berücksichtigt werden müssen. Durch die Absorption in dem ersten Einschichtempfänger, wird ein Signal erzeugt, das sowohl Informationen über die Messgaskomponente als auch über die anwesenden Quergase enthält. Ein Effekt der Absorption in dem ersten Einschichtempfänger ist aber auch, dass die verschiedenen Wellenlängenanteile der Strahlung unterschiedlich gewichtet werden, wobei die wellenlängenabhängige Wichtung dem Transmissionsverhalten der Messgaskomponente entspricht. In dem folgenden Einschichtempfänger wird diese wellenlängengewichtete Strahlung nun erneut integral erfasst, so dass es möglich ist, zwischen unterschiedlichen spektralen Formen, und damit unterschiedlichen Konzentrationen von Quergasen, zu unterscheiden. Es entsteht also auch hier eine n-dimensionale Ergebnismatrix, die über die jeweils n erhaltenen Signalwerte zur genauen Messgaskonzentration führt und den Quergaseinfluss kompensiert.alternative to fill the other single-layer receiver with Quergases can also fill these with the sample gas component become. This can be done with different concentrations the concentration in the first single-layer receiver is preferably the lowest. It will, not as above, the Quergase directly, but only their influence on the measurement the concentration of the sample gas component determined. As a result, are interfering gas influences directly compensated with the necessary accuracy of the sample gas component, without taking into account the dynamic ranges of the transverse gases Need to become. Due to the absorption in the first single-layer receiver, a signal is generated that contains both information about the measuring gas component as well as the present transverse gases contains. An effect of absorption in the first single-layer receiver But it is also that the different wavelength components the radiation are weighted differently, the wavelength-dependent Weighting corresponds to the transmission behavior of the sample gas component. In the following single-layer receiver, this wavelength-weighted radiation becomes now integrally captured again so that it is possible between different spectral shapes, and thus different Concentrations of transverse gases, to be distinguished. It arises so Again, an n-dimensional result matrix, the over the respective n obtained signal values for exact measurement gas concentration leads and compensates for the interference of the gas.
Zur weiteren Erläuterung der Erfindung wird im Folgenden auf die Figuren der Zeichnung Bezug genommen; im Einzelnen zeigen:to Further explanation of the invention will be in the following the figures of the drawing are referred to; in detail show:
Der
in
Die
Auswerteeinrichtung
In
die Messküvette
Beim
erfindungsgemäßen Gebrauch der Detektoranordnung
Bei
Verwendung der Detektoranordnung
Wie
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 1109418 [0002, 0003] - DE 1109418 [0002, 0003]
Zitierte Nicht-PatentliteraturCited non-patent literature
- - J. Staab: "Industrielle Gasanalyse", Oldenbourg, 1994, Seiten 167f und 172f [0002] - J. Staab: "Industrial Gas Analysis", Oldenbourg, 1994, pages 167f and 172f [0002]
Claims (3)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007020596A DE102007020596A1 (en) | 2007-05-02 | 2007-05-02 | Detector arrangement for non-dispersive infrared gas analyzer, has N-dimensional calibration matrix received signal values of sensors in presence from different well-known transverse gas concentrations |
US12/598,488 US8158945B2 (en) | 2007-05-02 | 2008-04-25 | Detector arrangement for a nondispersive infrared gas analyzer and method for the detection of a measuring gas component in a gas mixture by means of such a gas analyzer |
PCT/EP2008/055100 WO2008135416A1 (en) | 2007-05-02 | 2008-04-25 | Detector arrangement for a nondispersive infrared gas analyser and method for the detection of a measuring gas component in a gas mixture by means of such a gas analyser |
EP08749753.3A EP2142909B1 (en) | 2007-05-02 | 2008-04-25 | Detector arrangement for a nondispersive infrared gas analyser and method for the detection of a measuring gas component in a gas mixture by means of such a gas analyser |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102007020596A DE102007020596A1 (en) | 2007-05-02 | 2007-05-02 | Detector arrangement for non-dispersive infrared gas analyzer, has N-dimensional calibration matrix received signal values of sensors in presence from different well-known transverse gas concentrations |
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DE102007020596A1 true DE102007020596A1 (en) | 2008-11-06 |
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DE102007020596A Withdrawn DE102007020596A1 (en) | 2007-05-02 | 2007-05-02 | Detector arrangement for non-dispersive infrared gas analyzer, has N-dimensional calibration matrix received signal values of sensors in presence from different well-known transverse gas concentrations |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009059962A1 (en) * | 2009-12-22 | 2011-07-14 | Siemens Aktiengesellschaft, 80333 | NDIR dual-jet gas analyzer and method for determining the concentration of a sample gas component in a gas mixture by means of such a gas analyzer |
WO2017044436A1 (en) * | 2015-09-10 | 2017-03-16 | Honeywell International Inc. | Gas detector with normalized response and improved sensitivity |
US10393591B2 (en) | 2015-10-09 | 2019-08-27 | Honeywell International Inc. | Electromagnetic radiation detector using a planar Golay cell |
US10883875B2 (en) | 2015-03-05 | 2021-01-05 | Honeywell International Inc. | Use of selected glass types and glass thicknesses in the optical path to remove cross sensitivity to water absorption peaks |
EP3772644A1 (en) | 2019-08-06 | 2021-02-10 | Siemens Aktiengesellschaft | Non-dispersive infrared gas analyzer for determining at least two gas components in a measuring gas |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1109418B (en) | 1956-01-18 | 1961-06-22 | Beckman Instruments Inc | Non-dispersive infrared analyzer with positive filtering |
DE1181943B (en) * | 1960-03-09 | 1964-11-19 | Beckman Instruments Inc | Non-dispersive infrared absorption gas concentration meter |
GB1196326A (en) * | 1966-07-27 | 1970-06-24 | Onera (Off Nat Aerospatiale) | Improvements in, or relating to Infra-red Analysers |
US3679899A (en) * | 1971-04-16 | 1972-07-25 | Nasa | Nondispersive gas analyzing method and apparatus wherein radiation is serially passed through a reference and unknown gas |
US3899252A (en) * | 1974-06-28 | 1975-08-12 | Nasa | Ndir gas analyzer based on absorption modulation ratios for known and unknown samples |
US3953734A (en) * | 1974-11-22 | 1976-04-27 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Nulling device for detection of trace gases by NDIR absorption |
US3968370A (en) * | 1974-01-03 | 1976-07-06 | Bergwerksverband Gmbh | Non-dispersive infrared gas analyzer |
EP0387684B1 (en) * | 1989-03-16 | 1995-05-24 | The Perkin-Elmer Corporation | Improved pressure-modulated infrared gas analyzer and method |
-
2007
- 2007-05-02 DE DE102007020596A patent/DE102007020596A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1109418B (en) | 1956-01-18 | 1961-06-22 | Beckman Instruments Inc | Non-dispersive infrared analyzer with positive filtering |
DE1181943B (en) * | 1960-03-09 | 1964-11-19 | Beckman Instruments Inc | Non-dispersive infrared absorption gas concentration meter |
GB1196326A (en) * | 1966-07-27 | 1970-06-24 | Onera (Off Nat Aerospatiale) | Improvements in, or relating to Infra-red Analysers |
US3679899A (en) * | 1971-04-16 | 1972-07-25 | Nasa | Nondispersive gas analyzing method and apparatus wherein radiation is serially passed through a reference and unknown gas |
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US3899252A (en) * | 1974-06-28 | 1975-08-12 | Nasa | Ndir gas analyzer based on absorption modulation ratios for known and unknown samples |
US3953734A (en) * | 1974-11-22 | 1976-04-27 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Nulling device for detection of trace gases by NDIR absorption |
EP0387684B1 (en) * | 1989-03-16 | 1995-05-24 | The Perkin-Elmer Corporation | Improved pressure-modulated infrared gas analyzer and method |
Non-Patent Citations (2)
Title |
---|
J. Staab: "Industrielle Gasanalyse", Oldenbourg, 1994, Seiten 167f und 172f |
Staab.J.: Industrielle Gasanalyse. R. Oldenbourg Verlag Müchen Wien, 1994, S. 167-172 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009059962A1 (en) * | 2009-12-22 | 2011-07-14 | Siemens Aktiengesellschaft, 80333 | NDIR dual-jet gas analyzer and method for determining the concentration of a sample gas component in a gas mixture by means of such a gas analyzer |
DE102009059962B4 (en) * | 2009-12-22 | 2011-09-01 | Siemens Aktiengesellschaft | NDIR dual-jet gas analyzer and method for determining the concentration of a sample gas component in a gas mixture by means of such a gas analyzer |
US10883875B2 (en) | 2015-03-05 | 2021-01-05 | Honeywell International Inc. | Use of selected glass types and glass thicknesses in the optical path to remove cross sensitivity to water absorption peaks |
WO2017044436A1 (en) * | 2015-09-10 | 2017-03-16 | Honeywell International Inc. | Gas detector with normalized response and improved sensitivity |
CN108351293A (en) * | 2015-09-10 | 2018-07-31 | 霍尼韦尔国际公司 | Detector with normalized response and improvement sensitivity |
US10458900B2 (en) | 2015-09-10 | 2019-10-29 | Honeywell International Inc. | Gas detector with normalized response and improved sensitivity |
US10393591B2 (en) | 2015-10-09 | 2019-08-27 | Honeywell International Inc. | Electromagnetic radiation detector using a planar Golay cell |
EP3772644A1 (en) | 2019-08-06 | 2021-02-10 | Siemens Aktiengesellschaft | Non-dispersive infrared gas analyzer for determining at least two gas components in a measuring gas |
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